78361105 has 4 divisors (see below), whose sum is σ = 94033332. Its totient is φ = 62688880.

The previous prime is 78361097. The next prime is 78361139. The reversal of 78361105 is 50116387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50116387 = 887 ⋅56501.

It can be written as a sum of positive squares in 2 ways, for example, as 23126481 + 55234624 = 4809^2 + 7432^2 .

It is not a de Polignac number, because 78361105 - 2³ = 78361097 is a prime.

It is a super-2 number, since 2×78361105² = 12280925553642050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7836106 + ... + 7836115.

It is an arithmetic number, because the mean of its divisors is an integer number (23508333).

Almost surely, 2^78361105 is an apocalyptic number.

It is an amenable number.

78361105 is a deficient number, since it is larger than the sum of its proper divisors (15672227).

78361105 is a wasteful number, since it uses less digits than its factorization.

78361105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15672226.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 78361105 is about 8852.1808047509. The cubic root of 78361105 is about 427.9242030301.

The spelling of 78361105 in words is "seventy-eight million, three hundred sixty-one thousand, one hundred five".